Please email / call for availability
Get a quote
Enter your details and we will get back to you as soon as possible.

Product Features
The Crowcon T4 is a personal protection solution for detecting the four most common gas hazards:
  • carbon monoxide
  • hydrogen sulphide
  • flammable gases
  • oxygen depletion
Delivery options

At Cadmus Products, we prioritise efficient order delivery and offer competitive shipping rates worldwide. Our streamlined process ensures clarity and reliability for all your shipping requirements.

  • We handle consignments of various sizes across the UK and globally, primarily using DHL, but may select other couriers for specific needs.

  • For online laboratory product purchases, shipping costs are displayed at checkout. For quoted items, shipping prices will be included in your email quote.

  • Please visit our shipping and delivery page for more information here.
The Crowcon T4 Multi Gas Detector offers you compliance, robustness and low cost of ownership in a simple to use solution. The large single button and intuitive menu system allows T4 to be operated wearing gloves with minimal training. The T4 is durable by design and includes an integrated rubber boot as standard. An optional clip-on filter cover, which is easily removed and replaced, ensures sensors are protected in the dirtiest environments. Drop tested to 4m and well protected from water ingress through IP65 and IP67 certification, T4 allows uninterrupted working in the most demanding environments.

Now with improved detection of pentane, hexane and other long-chain hydrocarbons. The T4 contains a wide range of powerful features to make everyday use easier and safer:

TWA Resume

Unique to T4, the TWA Resume function ensures toxic gas exposure is calculated accurately over an entire shift,
even if T4 is switched off for a break or during travel to another site.

When most portable detectors are turned off, the algorithm that assesses TWA exposure assumes that it’s the end of the shift. When turned on again, these detectors act as if it is a new work shift, ignoring all previous measurements. The TWA Resume function, however, provides the option to include previous measurements from within the correct time frame.

18-hour battery

With a battery life of 18 hours, T4 allows multiple or longer shifts to be worked between recharging.

Positive Safety

Crowcon’s visual ‘traffic light’ indication, provides constant visual assurance that T4 is operating soundly and conforms to site bump test & calibration policy. The bright green and red Positive Safety LEDs are visible to all and offer a quick, simple and comprehensive indication of monitor status to both the user and others around them.
Size W135 x H80 x D35 mm (5.3 x 3.1 x 1.4in)
Weight 282g (9.9oz)
Durability Drop tested to 4m onto concrete
Alarms Audible >95dB
Bright red/blue visual LEDs
Integrated vibrating alert
Display Front-mounted, backlit. Optional 180° flip for easy viewing whilst worn
Logging 130 hours of data logging; Up to 3500 events
Battery Rechargeable Li-ion
18 hour typical runtime
5.5 hour recharge
Operating temperature -20°C to +55°C (-4°F to +131°F)*
Humidity 10 to 95% RH @ 40°C non-condensing
Ingress protection Independently tested to IP65 and IP67
Approvals IECEx: Ex db ia IIC T4 Gb Tamb -20°C to +55°C
ATEX: Ex II 2 G Ex db ia IIC T4 Gb Tamb -20°C to +55°C
UL: Use in hazardous locations Class 1 Div 1, groups A, B, C and D only as to intrinsic safety
INMETRO: Ex db ia IIC T4 Gb Tamb -20°C to +55°C
Compliance EMC Directive 2014/30/EU
Interface USB communications lead
Accessories Available separately:
Single unit cradle charger, 10 unit cradle charger, vehicle charger
Clip on filter plate for sensor protection in dusty environments
I-Test automated bump and calibration station
Crowcon Connect Compatible? Yes

* Toxic and oxygen sensors are not rated for continuous operation above 50°C (122°F)

Gas Range Resolution
Carbon monoxide (CO)  0-1000ppm  1ppm
Flammable  0-100% LEL  1% LEL
Hydrogen sulphide (H2S)  0-100ppm  1ppm
Oxygen (O2)  0-30% vol.  0.1% vol.
The following model is available to buy online:

Product Code Description
T4-HOCA-CRD T4 4 gas - H2S, O2, CO,CH4 % LEL + Cradle Charger

Please get in touch with us for pricing on other part numbers - [email protected] or 0330 088 0595.
Write Your Own Review
You're reviewing:Crowcon T4 Multi Gas Detector
Your Rating

Sign up for our latest offers

By submitting your details you consent to their use in accordance with our Privacy Notice